RRB NTPC 17 January 2017 Paper

Question : 102 of 120

Marks: +1, -0

The surface area (in sq.cm.) of a sphere with radius 1 cm. is: (take π = 22/7 )

Solution:

(4) R = 1 cm
Surface area of sphere

=4 π r^{2}

=4× {22}/{7} × (1)^{2}

={88}/{7}{cm}^{2}

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